test: Wait for iptables lock
test: Wait for iptables lock

Use the -w argument to wait for iptables lock during testing.

Closes #6209
michalskrivanek/cockpit,petervo/cockpit,garrett/cockpit,michalskrivanek/cockpit,dperpeet/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,dperpeet/cockpit,cockpit-project/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,andreasn/cockpit,larsu/cockpit,stefwalter/cockpit,harishanand95/cockpit,moraleslazaro/cockpit,andreasn/cockpit,mvollmer/cockpit,petervo/cockpit,xhad/cockpit,mareklibra/cockpit,deryni/cockpit,stefwalter/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,cockpituous/cockpit,mvollmer/cockpit,larsu/cockpit,cockpituous/cockpit,Scribery/cockpit,mareklibra/cockpit,xhad/cockpit,larskarlitski/cockpit,larskarlitski/cockpit,dperpeet/cockpit,garrett/cockpit,harishanand95/cockpit,SotolitoLabs/cockpit,michalskrivanek/cockpit,larskarlitski/cockpit,garrett/cockpit,deryni/cockpit,moraleslazaro/cockpit,petervo/cockpit,mareklibra/cockpit,deryni/cockpit,SotolitoLabs/cockpit,harishanand95/cockpit,Scribery/cockpit,Scribery/cockpit,xhad/cockpit,petervo/cockpit,cockpituous/cockpit,larsu/cockpit,Scribery/cockpit,cockpit-project/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,xhad/cockpit,harishanand95/cockpit,moraleslazaro/cockpit,larsu/cockpit,cockpit-project/cockpit,garrett/cockpit,moraleslazaro/cockpit,dperpeet/cockpit,cockpit-project/cockpit,Scribery/cockpit,mareklibra/cockpit,xhad/cockpit,garrett/cockpit,deryni/cockpit,dperpeet/cockpit,stefwalter/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,Scribery/cockpit,andreasn/cockpit,harishanand95/cockpit,stefwalter/cockpit,stefwalter/cockpit,petervo/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,michalskrivanek/cockpit,mvollmer/cockpit,deryni/cockpit,xhad/cockpit,martinpitt/cockpit,larskarlitski/cockpit,xhad/cockpit,cockpituous/cockpit,martinpitt/cockpit,Scribery/cockpit,martinpitt/cockpit,larskarlitski/cockpit,mareklibra/cockpit,michalskrivanek/cockpit,larskarlitski/cockpit,petervo/cockpit,larskarlitski/cockpit,deryni/cockpit,stefwalter/cockpit,andreasn/cockpit,moraleslazaro/cockpit,harishanand95/cockpit,mvollmer/cockpit,deryni/cockpit,petervo/cockpit,cockpituous/cockpit,stefwalter/cockpit,larsu/cockpit,dperpeet/cockpit,michalskrivanek/cockpit,dperpeet/cockpit,harishanand95/cockpit,mareklibra/cockpit,andreasn/cockpit,larsu/cockpit,cockpit-project/cockpit,michalskrivanek/cockpit